CleanWaterMD

Although a contractor list resource is desirable, and will one day hopefully be formalized through the Chesapeake Bay Landscape Professionals Certification program (date to be determined) which will certify contractors who are trained in storm water practices, one does not exist yet. I would highly recommend referring to county contractor lists. Two commonly used lists include Howard County and Montgomery County. These are not comprehensive but do at least meet the criteria for two county governments which are actively engaged in storm water remediation. Here are the links:
Montgomery County: http://goo.gl/IHyWUI
Howard County: http://goo.gl/gNNEd9